WO2024023031A1 - Antenne de type fil pour vitrage de véhicule - Google Patents

Antenne de type fil pour vitrage de véhicule Download PDF

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Publication number
WO2024023031A1
WO2024023031A1 PCT/EP2023/070474 EP2023070474W WO2024023031A1 WO 2024023031 A1 WO2024023031 A1 WO 2024023031A1 EP 2023070474 W EP2023070474 W EP 2023070474W WO 2024023031 A1 WO2024023031 A1 WO 2024023031A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
wire
isolation
wavelength
feeding point
Prior art date
Application number
PCT/EP2023/070474
Other languages
English (en)
Inventor
Kazuhiro Nakano
Inès ADOUANI
Vincent VANDENBERGHE
Manuel PAYEN
Original Assignee
Agc Glass Europe
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agc Glass Europe filed Critical Agc Glass Europe
Publication of WO2024023031A1 publication Critical patent/WO2024023031A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1271—Supports; Mounting means for mounting on windscreens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths

Definitions

  • the present invention relates to the field of wire-like antennas deposited on vehicle glazing.
  • WO2015/019904 discloses an antenna device which can reduce mutual interference between two antenna elements arranged adjacent to the same conductor, such as the roof of a vehicle. It relates to two antennas whose frequency bands are close to each other, such as, for example, a TV antenna between 470 and 710 MHz and an ITS (equivalent to V2X) antenna at 760 MHz.
  • a wire-like parasitic element (typically L-shaped) is put between the two antennas to reduce the coupling. This document also specifies the ideal length, shape and location of the parasitic element to reduce the coupling efficiently.
  • the parasitic element is typically L-shaped with a certain length on the window glass.
  • the parasitic element s effect depends on its length, its position and its shape. If the combined set of length, position and shape is not ideal, the parasitic element does not have the decoupling effect.
  • the parasitic element is visible from the passenger of the vehicle.
  • One branch of the L-shaped parasitic element cannot be hidden by the usual black band on the window glass. It leads to bad aesthetics and it may further have bad influence on driver’s view and therefore on safety.
  • the present invention concerns a wire-like antenna deposited on a vehicle glazing, near an edge of a vehicle opening.
  • the wire-like antenna comprises a feeding point, a first radiator part able to radiate and/or receive a first radio signal, the first radiator part being at least partially substantially orthogonal to the closest edge of the vehicle opening, and an equivalent transmission line part able to transmit the first radio signal between the feeding point and the first radiator part, the equivalent transmission line part being substantially parallel to the edge of the vehicle opening.
  • the wire-like antenna further comprises at least a first isolation tuner part, the first isolation tuner part being substantially parallel to the edge of the vehicle opening. The first isolation tuner part is connected to the equivalent transmission line part at a first connection point.
  • Fig.2 illustrates a portion of the vehicle glazing equipped with a wire-like antenna according to the present invention.
  • Fig.3 illustrates an embodiment where the wire-like antenna comprises a first and a second isolation tuner parts.
  • Fig.4 illustrates a case where the wire-like antenna comprises a first and a second radiator part.
  • Fig.5 illustrates an embodiment where the feeding point, the equivalent transmission line part, the first isolation tuner part and the second isolation tuner part are masked by a black band present on the vehicle glazing.
  • Fig.6a illustrates an example of a wire-like antenna without the present invention.
  • Fig.6b illustrates the same example of a wire-like antenna with two isolation tuner parts according to the present invention.
  • Fig.7a illustrates the measurement results of the coupling between the wire-like antenna and a first interfering antenna placed on a roof of the vehicle.
  • Fig.7b illustrates the measurement results of the coupling between the wire-like antenna and a second interfering antenna placed on a roof of the vehicle.
  • the present invention proposes a wire-like antenna, meaning an antenna in the form of a wire, as commonly used in the automotive field.
  • a vehicle includes car, van, lorry, motorbike, bus, tram, train, drone, airplane, helicopter and the like.
  • a vehicle glazing can refer to any window on a car, including a windshield, a rearlite, a sidelite and/or a roof.
  • a wire-like antenna can be formed by printing and baking paste containing conductive metal particles such as a silver paste, on an inner surface of a pane of glass. However, the invention is not limited to this forming method.
  • a linear element or a foil element made of a conductive material such as copper may be formed on an inner or outer surface of a pane of glass or may be affixed to a pane of glass with an adhesive or may be provided between two or more panes of glass (laminated glazing).
  • a wire-like antenna may be formed by forming a conductor layer given synthetic resin film in which a conductor layer of an antenna conductor is provided, of a synthetic resin film. Further, a wire-like antenna may be formed by forming a flexible circuit board on which an antenna conductor is formed.
  • the wire-like antenna is intended to be deposited near an edge of a vehicle opening.
  • the vehicle opening is closed by the glazing.
  • the antenna is usually deposited near the edge of such glazing, but it may happen the edge of the glazing does not coincide with the edge of the vehicle opening, for example when the glazing extends beyond the edge of the vehicle opening.
  • the present wire-like antenna comprises a feeding point.
  • the feeding point allows for electricity furnishing of the antenna.
  • the wire-like antenna further comprises at least a first radiator part.
  • This radiator part is able to radiate and/or receive a radio signal at radio frequency fri in a first frequency band.
  • the radiator part is at least partially substantially orthogonal to the closest edge of the vehicle opening, as well as being orthogonal to the closest edge of the vehicle glazing. If not, meaning if the radiator part was parallel to the edge of the vehicle glazing, then the propagation of the radio signal would become weak due to cancelling effect by image current induced on the edge of the vehicle opening. As the radiator part is at least substantially orthogonal to the edge of the vehicle glazing, the image current does not prevent the propagation of the radio wave.
  • the wire-like antenna further comprises an equivalent transmission line part.
  • This equivalent transmission line part is intended to transmit the first radio signal between the feeding point and the first radiator part.
  • the equivalent transmission line part is substantially parallel to the closest edge of the vehicle opening, as well as parallel to the closest edge of the vehicle glazing.
  • the equivalent transmission line part is put close to the edge of window glass, as well as the edge of the vehicle body opening.
  • the wire-like antenna further comprises a first isolation tuner part.
  • This first isolation tuner part may be L-shaped, T-shaped, meander-shaped or any other shape known by the skilled in the art.
  • the first isolation tuner part is substantially parallel to the edge of the vehicle opening, meaning the longest part of the first isolation tuner part is parallel to the edge of the vehicle opening.
  • One end of the first isolation tuner part is connected to the equivalent transmission line part at a first connection point.
  • the distance cfej between the equivalent transmission line part and the edge of the opening of the vehicle satisfies: where A rl is the wavelength of the radio signal corresponding to the radio frequency fri in a first frequency band, a glass is the effective shortening ratio of wavelength on glass, typically comprised between 0.5 and 0.7 depending on the thickness, glass material composition and the antenna wires’ thickness and width.
  • a rl is the wavelength of the radio signal corresponding to the radio frequency fri in a first frequency band
  • a glass is the effective shortening ratio of wavelength on glass, typically comprised between 0.5 and 0.7 depending on the thickness, glass material composition and the antenna wires’ thickness and width.
  • the length L IS01 of the path from the feeding point to the open end of the first isolation tuner part satisfies: is the wavelength of a first interfering radio signal to be decoupled from the wire-like antenna, N IS01 is an integer larger or equal to 1 , preferably comprised between 1 and 5, more preferably equal to 1 or 2, k ⁇ is a decimal representing the bandwidth (in ratio relative to the first interfering radio frequency fn) in which the isolation effect can be obtained.
  • k ⁇ is less or equal to 0.1 , more preferably less or equal to 0.05.
  • the isolation effect by the first isolation tuner part is effective in the bandwidth of +-10% of the interfering frequency fn, more effective in the band width of +-5% of the interfering frequency fn in the typical case for automotive window case (meaning the width of the wire of the first isolation tuner is between 0.4mm and 1 mm).
  • the value k ⁇ becomes larger if the width of the wire is increased.
  • Lcabie is the length of the feeding cable for the antenna, connecting the feeding point of the wire-like antenna to an amplifier input, acabie is the effective shortening ratio of wavelength on cable.
  • an isolation tuner part satisfying the above formula allows for a good isolation from another antenna emitting a signal at the interfering frequency fn by making the impedance of the wire-like antenna high at the radio frequency fn selectively. There is therefore no need to put additional element, such as a noise canceller element between the wire-like antenna on the vehicle glazing and another antenna on the roof of the vehicle, so that the isolation effect can be obtained even though there is not enough space between those antennas.
  • the wire-like antenna further comprises a second isolation tuner part on the equivalent transmission line part.
  • This second isolation tuner part may be L-shaped, T-shaped, meander-shaped or any other shape known by the skilled in the art.
  • This second isolation tuner part is substantially parallel to the edge of the vehicle opening, meaning the longest part of the second isolation tuner part is parallel to the edge of the vehicle opening.
  • the second isolation tuner part is connected to the equivalent transmission line part at a second connection point.
  • the length L IS02 of the path from the feeding point to the open end of the second isolation tuner part satisfies: where A (2 is the wavelength of a second interfering radio signal to be decoupled from the wire-like antenna, N IS02 is an integer larger or equal to 1 , preferably comprised between 1 and 5, more preferably equal to 1 or 2, k 2 is a decimal representing the bandwidth (in ratio relative to the second interfering radio frequency fa) in which the isolation effect can be obtained. k 2 is less or equal to 0.1 , preferably less or equal to 0.05.
  • a second isolation tuner part satisfying the above equation allows for a good isolation from another antenna emitting a signal at the interfering frequency fa by making the impedance of the wire-like antenna high at the radio frequency fi2 selectively. There is therefore no need to put additional element, such as a noise canceller element between the wire-like antenna and another antenna, so that the isolation effect can be obtained even though there is not enough space between those antennas.
  • the invention therefore allows for two and even more isolation tuner parts. It allows for good isolation towards multiple radio signals.
  • the length L RAD1 of the path from the feeding point to the open end of the first radiator part satisfies: where N RAD1 is an integer larger or equal to 1 , preferably N RAD1 is equal to 1 , 2, 3, 4 or 5.
  • the wire-like antenna further comprises a second radiator part able to radiate and/or receive a radio signal in a second frequency band in which the wire-like antenna should be functional as an antenna.
  • the second radiator part is at least partially substantially orthogonal to the edge of the vehicle glazing.
  • the equivalent transmission line part is able to transmit the radio signal in the second frequency band between the feeding point and the second radiator part.
  • the length L RAD2 of path from the feeding point to the open end of the second radiator part satisfies: where N RAD2 is an integer larger or equal to 1 , preferably N RAD2 is equal to 1 , 2, 3, 4 or 5, and r2 is the wavelength of the radio signal at the radio frequency fa in the second frequency band to be received and/or emitted by the wire-like antenna.
  • the radio signal frequencies fa, fa, fn and fa satisfy: fr2 ⁇ fll ⁇ frl fr2 ⁇ fl2 ⁇ frl meaning the wire-like antenna is designed to be functional in two different frequency bands, and the radio frequencies of the interfering signals exist in between those two frequency bands.
  • the present wire-like antenna could achieve good performance as an antenna in two frequency bands as well as isolating the interfering signals between them.
  • the first frequency band can be 470-710 MHz (meaning fri is one of the frequency from 470MHz to 710MHz) and the second frequency band can be 170-240MHz (meaning fr2 is one of the frequency from 170MHz to 240MHz), and the first interfering frequency fn can be 434 MHz and the second interfering frequency fa can be 315 MHz, both corresponding to RKE frequencies.
  • the wire-like antenna is a dual band antenna for TV and DAB functions and isolated from the interfering signals from the other antenna for RKE function.
  • the feeding point, the equivalent transmission line part, the first isolation tuner part and eventually the second isolation tuner part are masked by a black band on the vehicle glazing.
  • a black band on the vehicle glazing.
  • the elements of the wire-like antenna are put along the edge of the vehicle glazing, they can be hidden by a black layer printed on the glass. This way they are less visible from the passengers of the vehicle.
  • Such black band can be made of ceramic or black enamel.
  • Fig.1a illustrates one example of a vehicle glazing (100), here being a rearlite, meaning the glazing placed in the vehicle opening (110) present in the back of a vehicle.
  • a wire-like antenna (1 ) is usually placed on such rearlite, even if it can be placed elsewhere, meaning on another glazing of the vehicle.
  • Fig.1b illustrates an interfering antenna (200). It is usually placed on the roof of the vehicle, even if it can be put elsewhere, meaning on another exterior or interior part of the vehicle. As illustrated in the present figure, the vehicle glazing (100) usually exceeds the vehicle opening (110), meaning the vehicle glazing is bigger in size then the vehicle opening (110). However, the vehicle glazing (100) can also match the vehicle opening (110). For ease of the representation, the following figures will represent this last case, without limiting the present invention to this case.
  • Fig.2 illustrates a portion of the vehicle glazing (100).
  • the vehicle glazing (100) is equipped with a wire-like antenna (1 ) according to the present invention.
  • the wirelike antenna (1 ) is deposited next to an edge of the vehicle opening (110).
  • the wire-like antenna (1 ) comprises a feeding point (2), a radiator part (31 ) and an equivalent transmission line part (4).
  • the radiator part (31 ) is at least partially substantially orthogonal to the closest edge of the vehicle opening (110), as well as being orthogonal to the closest edge of the vehicle glazing (100).
  • the equivalent transmission line part (4) connects the feeding point (2) and the radiator part (31 ) so that the wire-like antenna (1 ) is able to receive and/or transmit a radio signal of a wavelength A rl through the radiator part (31 ).
  • the equivalent transmission line part (4) is substantially parallel to the closest edge of the vehicle opening (110), as well as parallel to the closest edge of the vehicle glazing (100).
  • the equivalent transmission line part (4) is put close to the edge of the vehicle opening (110), as well as to the edge of the vehicle glazing (100).
  • the wire-like antenna (1 ) further comprises an isolation tuner part (51 ).
  • the isolation tuner part (51 ) is substantially parallel to the edge of the vehicle opening (110), as well as to the edge of the vehicle glazing (100).
  • the isolation tuner part (51 ) is connected to the equivalent transmission line part (4) at a first connection point (510).
  • Fig.3 illustrates an embodiment where the wire-like antenna (1 ) comprises a first and a second isolation tuner parts (51 , 52). Both isolation tuner parts are substantially parallel to the edge of the vehicle opening (110), as well as to the edge of the vehicle glazing (100).
  • the first isolation tuner part (51 ) is connected to the equivalent transmission line part (4) at a first connection point (510), while the second isolation tuner part (52) is connected to the equivalent transmission line part (4) at a second connection point (520).
  • Fig.4 illustrates a case where the wire-like antenna (1 ) comprises a first and a second radiator part (31 , 32). Both radiator parts (31 , 32) are able to radiate and/or receive a radio signal. Both radiator parts (31 , 32) are at least partially substantially orthogonal to the edge of the vehicle opening (110), as well as to the edge of the vehicle glazing (100).
  • the equivalent transmission line part (4) is able to transmit both radio signals emitted and/or received by the radiator parts (31 , 32).
  • Fig.5 illustrates an embodiment where the feeding point (2), the equivalent transmission line part (4), the first L-shaped isolation tuner part (51 ) and the second L-shaped isolation tuner part (52) are masked by a black band (300) present on the vehicle glazing (100).
  • Fig.6a illustrates an example of a wire-like antenna (1 ) without the present invention.
  • the wire-like antenna (1 ) is placed on a tempered glass (thickness 3.1 mm).
  • the wire-like antenna (1 ) is composed of printed silver ceramics lines (line width 0.7mm), meaning a gias s is approximately 0.67.
  • the wire-like antenna (1 ) is connected to an amplifier by a typical cable wrapped by thin PVC layer, meaning Ocabie is approximately 0.97.
  • Fig.6b illustrates the same example of a wire-like antenna (1 ), but this time with two isolation tuner parts (51 , 52) according to the present invention, as described in Fig.3.
  • Fig.7a illustrates the measurement results of the coupling between the wirelike antenna (1 ) and an interfering antenna (200) placed on a roof of the vehicle.
  • the wire-like antenna (1 ) comprising the two isolation tuner parts (51 , 52) as shown in Fig.6b has a weaker coupling, meaning a signal transmission lower than -20dB, to the interfering antenna (200) than the comparative example as shown in Fig.6a.
  • Fig.7b illustrates the measurement results of the coupling between the wirelike antenna (1 ) and an interfering antenna (210) placed on a roof of the vehicle.
  • the wire-like antenna (1 ) comprising the two isolation tuner parts (51 , 52) as shown in Fig.6b has a weaker coupling, meaning a signal transmission lower than -20dB, to the interfering antenna (210) than the comparative example as shown in Fig.6a.

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  • Details Of Aerials (AREA)

Abstract

La présente invention concerne une antenne de type fil déposée sur un vitrage de véhicule, à proximité d'un bord d'une ouverture de véhicule. L'antenne de type fil comprend un point d'alimentation, une première partie radiateur apte à rayonner et/ou à recevoir un premier signal radio, la première partie radiateur étant au moins en partie sensiblement orthogonale au bord le plus proche de l'ouverture de véhicule, et une partie ligne de transmission équivalente apte à transmettre le premier signal radio entre le point d'alimentation et la première partie radiateur, la partie ligne de transmission équivalente étant sensiblement parallèle au bord de l'ouverture de véhicule. L'antenne de type fil comprend en outre au moins une première partie syntoniseur d'isolation, la première partie syntoniseur d'isolation étant sensiblement parallèle au bord de l'ouverture de véhicule. La première partie syntoniseur d'isolation est connectée à la partie ligne de transmission équivalente au niveau d'un premier point de connexion.
PCT/EP2023/070474 2022-07-27 2023-07-24 Antenne de type fil pour vitrage de véhicule WO2024023031A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22187347 2022-07-27
EP22187347.4 2022-07-27

Publications (1)

Publication Number Publication Date
WO2024023031A1 true WO2024023031A1 (fr) 2024-02-01

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080158074A1 (en) * 2006-12-28 2008-07-03 Agc Automotive Americas R&D, Inc. Multi-Band Strip Antenna
FR2929763A1 (fr) * 2008-04-07 2009-10-09 Nippon Sheet Glass Co Ltd Antenne embarquee
EP2648275A1 (fr) * 2010-11-29 2013-10-09 Asahi Glass Company, Limited Antenne intégrée dans un pare-brise, pour automobile, et vitrage pour automobile
WO2015019904A1 (fr) 2013-08-05 2015-02-12 旭硝子株式会社 Dispositif d'antenne
US20190081386A1 (en) * 2017-09-11 2019-03-14 Apple Inc. Electronic Device Having Isolated Antenna Structures
WO2022096594A1 (fr) * 2020-11-05 2022-05-12 Agc Glass Europe Antenne de vitre de véhicule

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080158074A1 (en) * 2006-12-28 2008-07-03 Agc Automotive Americas R&D, Inc. Multi-Band Strip Antenna
FR2929763A1 (fr) * 2008-04-07 2009-10-09 Nippon Sheet Glass Co Ltd Antenne embarquee
EP2648275A1 (fr) * 2010-11-29 2013-10-09 Asahi Glass Company, Limited Antenne intégrée dans un pare-brise, pour automobile, et vitrage pour automobile
WO2015019904A1 (fr) 2013-08-05 2015-02-12 旭硝子株式会社 Dispositif d'antenne
US20190081386A1 (en) * 2017-09-11 2019-03-14 Apple Inc. Electronic Device Having Isolated Antenna Structures
WO2022096594A1 (fr) * 2020-11-05 2022-05-12 Agc Glass Europe Antenne de vitre de véhicule

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